The amount of space an object occupies is its volume. Volume is a measure of the three-dimensional space that an object takes up. It is often measured in units like liters, milliliters, cubic meters, or cubic centimeters.
Mass, on the other hand, refers to the amount of matter in an object and is typically measured in grams or kilograms. Gravity is a force that attracts objects towards each other, and weight is the force exerted on an object due to gravity. Neither gravity nor weight directly measures the space an object occupies.
So, the correct answer is B) Volume.